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For example the warning for "treating generator comprehension as list" doesn't get printed unless there were errors too. This was due to the fact mypyc/build.py was only checking errors.num_errors to decide whether to print messages to STDOUT.
To be honest, the generate_c() logic was pretty messy, so I broke out the message printing logic into a separate helper function and made liberal use of early exits.
Fixes mypyc/mypyc#873 (comment).